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Unit 3: Aggregate Demand and Supply and Fiscal Policy
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Shifters of Aggregate Demand Shifters of Aggregate Supply
AD = C + I + G + X Change in Consumer Spending Change in Government Spending Change in Investment Spending Net EXport Spending Shifters of Aggregate Supply AS = I + R + A + P Change in Inflationary Expectations Change in Resource Prices Change in Actions of the Government Change in Productivity (Investment)
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Practice 3
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Answer and identify shifter: C.I.G.X or R.A.P
B A D A D B A A C A major increase in productivity. A 4
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Putting AD and AS together to get Equilibrium Price Level and Output
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Inflationary and Recessionary Gaps
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Example: Assume the government increases spending
Example: Assume the government increases spending. What happens to PL and Output? LRAS Price Level AS PL and Q will Increase PL1 PLe AD1 AD QY Q1 GDPR 7
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Inflationary Gap Output is high and unemployment is less than NRU LRAS
Price Level AS Actual GDP above potential GDP PL1 AD1 QY Q1 GDPR 8
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Stagnate Economy + Inflation
Example: Assume the price of oil increases drastically. What happens to PL and Output? LRAS Price Level AS1 AS PL1 Stagflation Stagnate Economy + Inflation PLe AD Q1 QY GDPR 9
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Recessionary Gap Output low and unemployment is more than NRU LRAS
Price Level AS1 Actual GDP below potential GDP PL1 AD Q1 QY GDPR 10
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AD and AS Practice Worksheet
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How does this cartoon relate to Aggregate Demand?
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Draw AD and AS at full employment
LRAS AS Price Level P2 P1 AD2 AD=C+I+G+X Qf (Y*or FE) Q2 GDPR Output Increases PL Increases 13
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Short Run and Long Run 14
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Shifts in AD or AS change the price level and output in the short run
LRAS Price Level AS PLe AD QY GDPR 15
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Example: Assume consumers increase spending
Example: Assume consumers increase spending. What happens to PL and Output? LRAS Price Level AS PL1 PLe AD1 AD QY Q1 GDPR 16
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Now, what will happen in the LONG RUN?
Inflation means workers seek higher wages and production costs increase LRAS Price Level AS1 AS PL2 Back to full employment with higher price level PL1 PLe AD1 AD QY Q1 GDPR 17
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AS increases as workers accept lower wages and production costs fall
Example: Consumer expectations fall and consumer spending plummets. What happens to PL and Output in the Short Run and Long Run? Price Level LRAS AS AS1 AS increases as workers accept lower wages and production costs fall PLe Short Run -AD Falls, PL and Q fall Long Run- AS Increases as workers accept lower wages and production costs fall. PL goes down, Q goes back to Full Employment PL1 PL2 AD AD AD1 Q1 QY GDPR 18
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